 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.views.tasklist;

 import java.util.ArrayList ;
 import java.util.HashMap ;

 import org.eclipse.core.resources.IMarker;
 import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.IConfigurationElement;
 import org.eclipse.core.runtime.IExtension;
 import org.eclipse.core.runtime.IExtensionPoint;
 import org.eclipse.core.runtime.Platform;

 /**
  * Maintains a model of all known marker types.
  */
 class MarkerTypesModel {
     /**
      * Maps from marker type id to MarkerType.
      */
     private HashMap types;

     /**
      * Creates a new marker types model.
      */
     public MarkerTypesModel() {
         types = readTypes();
     }

     /**
      * Returns the marker type with the given id, or <code>null</code> if there is no such marker type.
      */
     public MarkerType getType(String id) {
         return (MarkerType) types.get(id);
     }

     /**
      * Returns all known marker types.
      */
     public MarkerType[] getTypes() {
         MarkerType[] result = new MarkerType[types.size()];
         types.values().toArray(result);
         return result;
     }

     /**
      * Returns the label for the given marker type.
      * Workaround until we have labels in XML.
      */
     private String getWellKnownLabel(String type) {
         if (type.equals(IMarker.PROBLEM)) {
             return "Problem";//$NON-NLS-1$
 }
         if (type.equals(IMarker.TASK)) {
             return "Task";//$NON-NLS-1$
 }
         if (type.equals("org.eclipse.jdt.core.problem")) { //$NON-NLS-1$
 return "Java Problem";//$NON-NLS-1$
 }
         return type;
     }

     /**
      * Reads the marker types from the registry.
      */
     private HashMap readTypes() {
         HashMap types = new HashMap ();
         IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(
                 ResourcesPlugin.PI_RESOURCES, ResourcesPlugin.PT_MARKERS);
         if (point != null) {
             // Gather all registered marker types.
 IExtension[] extensions = point.getExtensions();
             for (int i = 0; i < extensions.length; ++i) {
                 IExtension ext = extensions[i];
                 String id = ext.getUniqueIdentifier();
                 String label = ext.getLabel();
                 if (label.equals("")) {//$NON-NLS-1$
 label = getWellKnownLabel(id);
                 }
                 ArrayList supersList = new ArrayList ();
                 IConfigurationElement[] configElements = ext
                         .getConfigurationElements();
                 for (int j = 0; j < configElements.length; ++j) {
                     IConfigurationElement elt = configElements[j];
                     if (elt.getName().equalsIgnoreCase("super")) {//$NON-NLS-1$
 String sup = elt.getAttribute("type");//$NON-NLS-1$
 if (sup != null) {
                             supersList.add(sup);
                         }
                     }
                 }
                 String [] superTypes = new String [supersList.size()];
                 supersList.toArray(superTypes);
                 MarkerType type = new MarkerType(this, id, label, superTypes);
                 types.put(id, type);
             }
         }
         return types;
     }
 }

